鄂尔多斯盆地陇东地区上三叠统延长组沉积体系特征及油气勘探意义  

Characteristics of the Sedimentary System and Its Significance in Petroleum Exploration of Upper Triassic Yanchang Formation in Eastern Gansu Area, Ordos Basin

作　　者：高伟[1] 费世祥[1] 刘安[1] 席妮妮[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院

出　　处：《低渗透油气田》2012年第1期1-7,62,共8页

摘　　要：在野外露头观察、岩心描述及钻井测井资料分析的基础上，结合区域构造地质背景，对陇东地区上三叠统延长组沉积体系特征及演化规律进行了详细的研究。结果表明：陇东地区延长组主要发育湖泊、浊流、辫状河三角洲以及曲流河三角洲沉积体系。沉积体系的演化，在纵向上形成了3套有利的生、储、盖组合，成藏条件优越，预示了陇东地区延长组具有很大的油气勘探潜力。石油地质条件分析表明，沿湖发育的三角洲前缘砂体及深湖一半深湖浊积岩砂体是比较有利的储集体，是下一步勘探的重点目标。Based on observing outcrops, core description and drilling and logging data analysis, characteristics of the sedimentary system and evolution laws of Upper Triassic Yanchang Formation in Eastern Gansu Longdong area are studied in detail by combining the areal structure geological background. The result shows that the lakes, turbidity, braided deltas and meandering river deltas are mainly developed in Yanchang Formation of Eastern Gansu area. The evolution of the sedimentary system has formed vertically three sets of source-reservoir- seal assemblages. The advantageous condition of the reservoir formation indicates a great exploration potential in Yanchang Formation of Eastern Gans （Longdong） area. The analysis of petroleum geological conditions shows that delta fronts sandstone bodies developed along the lake and deep- or semideep-lake turbidite sandstone bodies are favorable reservoir bodies, and primary targets for the next step exploration.

关 键 词：沉积体系 延长组 陇东地区 鄂尔多斯盆地 

分 类 号：P618.130.2[天文地球—矿床学]